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twk
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re: How to Save Power on LED Drivers for LED Traffic Signs and Message Signs
twk   7/20/2009 8:41:44 AM
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Great question: Why are there LEDs in the 'dark' area??

Etmax
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re: How to Save Power on LED Drivers for LED Traffic Signs and Message Signs
Etmax   5/27/2009 10:28:27 AM
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I agree with BVR, why would you have LED's in dark areas unless you are in the business of making drivers and LED's. I don't believe ours do (Australia). A properly designed driver would consume only nanoamps when off though. The snow comment made by MD17 suggests an integral heater that only runs when frosty might offer the best of both worlds.

MD17
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re: How to Save Power on LED Drivers for LED Traffic Signs and Message Signs
MD17   5/22/2009 12:24:15 PM
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Low Energy Traffic Signals are not always a good thing; Here in the snowy North you can always identify LED based traffic signals-- they are the snow encrusted objects hanging from poles at busy intersections. Depending on the air temperature and rate of snow fall, you may or may not be able to see a dim glow emanating from the clump of snow.



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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